Lock



Oct. 30, 1934. H. BIEMER 1,979,186

LOCK

4Filed Nov. 14, 1932 2 Sheets-Sheet l H. alam-:R

' -Ofi-'30, 1934.v

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I /emcf `rammed Oct. 3o, 1934 v LOCK Heinrich Biemer, Berlin, Germany Application November 14, 1932, Serial No. 642,624

' In Germany March 9, 1931 4 Claims.

This invention relates to a lock with a rotatable locking cylinder, which is distinguished by particularly simple construction, with particularly reliable `protection of the lock against unauthor- 5 ized opening.

A padlock and a door lock according to the present invention are diagrammatically illustrated by way of .examplein the accompanying drawings,

in which Figure 1 shows .a longitudinal section through a padlock,

Figure .2 a front View thereof,

Figure 3 a cross section through the locking cylinder of the lock in a somewhat. modified constructional form, also on a larger scale,

Figure 4 a plan of the locking cylinder of, the lock on an enlarged scale, with the key inserted, Figure 5 is an elevational view corresponding to Figure 4,

Figure 6 is an end view of the locking cylinder as seen from theinside of the lock.

7 to 10 show details on a larger scale. Figures 11 and 12 are side views of the key showing opposite sides thereof, and

Figure 13 is an elevational view, Ipartially in section, of a lock according to the invention in a somewhat modified form of construction. In these drawings, 1 denotes the casing of a padlock, 2 the shackle at the top of the padlock, 3 a locking cylinder, and 4 a locking bolt, which, by entering an aperture 5 in a part 6 of the shackle 2 keeps the latter in the locked position. 7 is an opening spring, which throws up the shackle 2 when the locking bolt 4 is retracted. '35 9. These tumblers are arranged side by side in direct contact with one another in the locking cylinder 3 without a spring, as will be seen from Figures 1, 4 vand 5, and are slidable in their lon- '40 gitudinal direction in the locking cylinder by means of guiding membersv 10 to 12, 13 and 14, the lugs 9 preventing the tumblers from dropping out.

There is preferably provided in the interior of the locking cylinder a guiding rib 15, the purpose of which will hereinafter be further described.

l In place of the tumblers 8 with-a lug 9 according to Figure 3, tumblers 16 with a lug 17 and an auxiliary lugv 18, as shown in Figure, 10, are also possible. With this form of the plate tumblers the key guide can be still more simply 'constructed relative to Fig. 3. 'I'he auxiliary lug 18 prevents the tumblers from falling `out, while the lug 17 1 5 serves for raising the tumblers with the key. d

In Figure 3 is shown plate tumblers s, with lugs' It is obvious from,Figure 5 that the tumbler strips are mounted in longitudinal slots of the locking cylinder which are open on one side.

In order to prevent the tumblers 8- dropping out of the locking cylinder inV the longitudinal direction thereof, a holding member 19 is provided, which preferably consists of a sheet metal plate with an aperture 20 in the middle, and is inserted in suitable grooves 21 in the locking cylinder. According to Fig. 4 the outer guide members 10 are extended in order to be able to receive a part carrying the locking bolt- 4. ThisV consists of a member 4a fitting between the extensions of 10 and a cam disc 4c. The cylindrical member 4a has flat lateral surfaces 4e and carries a spring 4b which is held by two projections 4d. 'On rotating the locking cylinder the part 4a, 4c is carried along, whereby the cam disc 4c is moved by a shoulder or projection la-on the housing 1 in the direction A in opposition to the action of the spring 4b.' The locking bolt is thereby withdrawn from the opening 5 and the hook 2 released for opening the lock.

In Figures 11 and v12 is shown a key 22 suitable for this lock, with lateral cam grooves 23 and 24 and a guiding groove 25. The latter ensures the key only being introduced into the locking cylinder in the correct position, which is the case when the guiding rib 15 engages in this groove.

On the frontend of the key is provided an in clined surface 26, the object of which is to lift the lugsv 9 or 17 when the key is being introduced, and to effect the introduction into the cam grooves 23 and 24. Y

The combination hereinbeforedescribed already yields a very good and simple lock, which is cheap to manufacture and easy to mount.

In a particularly advantageous form of construction, however, an additional protective member 27 isalso provided, which is subject to the action of a spring 28. In the constructional example shown, the same consists of a U-shaped body, and has a surface, namely the inclined surface 29, which is adapted to be engaged by the inclined surface 26 of the key. Upon the key being introduced into the locking cylinder the inclined surface 26 acts upon the' inclined surface 29, and, when the key is completely inserted, the protective member 27 is drawn back into the opening position, that is to say, into the interior of the locking cylinder, against the action of theV spring 28, as will be seen from Figures 4 and 5`. From Figure 6 it will be seen how this protective member normally protrudes from the locking cylinder 3 under the action of the spring 28 and 110 part of hereinbefore described. 32 denotes a locking bar.

33 and 34 are means for connectingthe locking cylinder with the locking bar. The parts 35, 36 and 3'7 form the lock casing, and 38 and 39 are parts of the protective device.

With a lock of the present vconstruction it is possible to keep the locking cylinder exceedingly short, and nevertheless to maintainv great safety of the lock. There may for example be lodged as many as twenty tumblers or more upon a locking cylinder length of 1' centimetre.

A further advantage of the present construction consists in the fact that the lateral cam grooves of the key, evenv when the lock has been in use for a long time, cannot become damaged or worn out, as is the case when the tumblers are subject to spring pressure.l A failure of the lock on this ground. therefore cannot occur. On the other hand this diflculty lcannot arise by employing the supplementary protective member subject to spring action, because this is not moved by the lateral cam grooves but by the inclined front surface of the key. The key is not however liable -to be damaged at this point, owing to its com- -paratively broad surface, and owing to the large bearing surface of the protective member thereon.

` The lock is of course not restricted to the conlstructional forms illustrated, but the essential this lock, namely the locking cylinder with all its parts, may be employed in locks of all kinds into which a rotatable locking cylinder can be fitted. l

What I claim iszf- 1. A lock, consisting of a lock casing, a." locking cylinder having a longitudinal key-way and beside the same at each sidea longitudinal slot open on one side, grooves opening into the slots through the outer walls thereof, a plurality of plate tumy blers arranged in the longitudinal, slots without a spring and lying with their broadside directly on one another and having lateral-lugs which extend into the key-wayand a holdingmember inserted in the grooves in the outer Walls of the `slots and closing the longitudinal slots at their open end and holding the tumblers in the longitudinal direction of the locking cylinder.

2. A lock, consisting of a. lock casing, a locking cylinder having a longitudinal key-way and beside the same at each side -a longitudinal slot open on one side, a plurality of plate tumblers arranged in the longitudinal slots without a spring and lying with their broad side directly' on one another and having lateral lugs which extend into the key-way, a holding member closing the longitudinal slots at their open end and holding the tumblers in the longitudinal direction of the locking cylinder, a locking bolt, a cam disc carried with the inner end of the bolt, a cylindrical member carried with the same disc and having flat lateral surfaces engaging between extensions of the outer walls of the longitudinal slots and adapted to be turned together with the locking cylinder by means `of a key.

r3. A lock, consisting of a lock casing, a locking cylinder having a longitudinal key-way and beside the same at each side alongitudinal slot open -on one side, a plurality of plate tumblers arranged in the longitudinal slots without a spring and lying with their broad side directly on one another and having lateral broad auxiliary lugs and narrower lugs thereon which extend into the key-way, and a holding member closing the longitudinal slots at their open end and holding the tumblers in the longitudinal direction of the locking cylinder.

4. A lock, consisting of a lock casing, a locking cylinder having a longitudinal key-way and beside. the same at each side a longitudinal slot open on one side, a plurality of plate tumblers arranged in the longitudinal slots without a spring and lying with their broad side directly on one another and having lateral lugs Which extend into the key-way, a holding member closing the longitudinal slots at their open end and holding the tumblers in the longitudinal direction ofv the locking cylinder, a supplementary protective member arranged between lthe extensions of vthe outer walls -of the longitudinal slots in front of the holding member closing the longitudinal slots,

Aand a rod shaped spring mounted in a longitudinal groove on the periphery of the locking cylinder and acting on the protective member, the

latter having relatively large guiding surfaces adaptedvto be engaged by an inclined surface at vthe front end of the key for the purpose of bringing the protective member into the opening posi-- tion. l

HEINRICH BIEMER. 

